Hayward SX210AA1 20 in. Filter Body With Skirt
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Description & Features+
Features. The oldest and most popular method of filtration is sand.. 1) When in the filtration mode, water always flows from top to bottom. 2) They all have some sort of lateral or under drain with slots to hold back sand while allowing clean, filtered water to pass through.. High-rate sand filters use a special filter sand, normally 0.45 to 0.55 mm., because it has sharp edges that serve to separate particles, allowing filtration to take place.. They operate on the basis of depth filtration; dirt is driven through the sand bed and trapped in the minute spaces between the particle of sand. Initially, a clean sand bed will remove larger particles, and then, as the bed starts to load up, it will remove finer particles.. Cleaning of the media, or sand bed, is accomplished through reversing the flow through the filter, to the waste line. This is known as backwashing- SKU: BAYST17954
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